Question

A worker takes a random sample of 200 bolts and finds that 30 of them are either too long or Too Short thus making them unusable. Estimate the number of unusable bolts and a production of 17,000 bolts.

A. 1,610 Bolts

B. 2,550 Bolts

C. 2,140 Bolts

D. 2,260 Bolts


I got D. I just need to be sure it is the right answer.

Answer 1

B

Explanation:

30 are unusable in 200. So how many are unusable in 17,000??

We can set up a ratio and figure out the answer right away! Let x be the number of unusable bolts in 17,000, so we can write:

`(30)/(200)=(x)/(17,000)\\200x=30*17000\\200x=510,000\\x=(510,000)/(200)\\x=2550`

THus, number of unusable bolts is 2550. B is right.